Liquid-heating apparatus.



H. JUNKERS.

LIQUID HEATING APPARATUS.

APPLICATION FILED DEC. 30. 1913- Patented Mar. 30, 1915.

HUGO JUNKERS, 0F AACHEN, GERMANY.

LIQUID-HEATING APPARATUS.

Specification of Letters Patent.

Patented Mar. 30, 1915.

.original application filed May 21,1907, Serial No. 374,851. Divided andthis application filed December 30,

1913. Serial No. 809,466.

To all whom it may concern.-

Be it known t at I, HUGO JUNKERS, a subject of the Kin of Prussia,residing at Aachen, No. 68 @ismarckstrasse, in the Kingdom of Prussia,Empire of Germany, have invented certain new and useful Im; provementsin Liquid-Heating Apparatus; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to improvements in a liquid-heating apparatus ofthe character disclosed in United States Letters Patent No. 1,085,341granted to me January 27th, 1914, of which this application is adivision.

The claims of the above-mentioned patent are, for the main part,directed to the feature that the channelsof the liquid-com tainingstructure are closer together at the region of the greatestheat-absorption by the mantle, thereby causing a more perfectinterchange of heat between the heating gases and the liquid. Accordingto the present invention the interchange of heat is still furtherincreased by the fact that, at the region of the greatestheat-absorption by the mantle, the latter possesses a greatercross-section and hence a greater capacity for absorbing and conductingthe heat.

This can be efiected by reinforcing the mantle at this region by meansof sheet-iron plates which are in heat-conducting connection with themantle. The mantle may also be reinforced by enlarging it at intervalsin the direction of the flow of heat, that is to say by causing themantle to become thicker toward the places where the liquid-containingchannels are fastened. Moreover, the

. necessary increase bf the cross-section can be obtained by properlyconstructing the plates absorbing the heat of the combustion gases.

In the accompanying drawings: Figure 1 is a vertical section of theliquid-heating apparatus and Fig. 2 is a horizontal section of the same,the upper part being taken on line A-B and the lower part on line CD ofFig. 1, while Fig. 3 is a section of the unwound lamel heating bodyshowing a special construction of the lamels.

Above the gas burner 1 is arranged the combustion chamber formed bymantle 2, which carries in heat-conducting connection therewith theliquid-containing structtre of channels, forming preferably a spiral 3..At the upper part, the region of the greatest heat'absorption by themantle, the channelsplral is preferably wound more closely thanelsewhere. Besides, there is arranged in this region the lamel heatingbody which consists of plates.- 5 radially arranged between the mantle 2and a central inner cylinder or hood 4 which is closed at the top, sothat the combustion gases are forced to take their way through thisheating body. The plates absorb the heat from the heating gases andtransfer it by the medium of the mantle and the liquid-containingchannels to the liquid.

According to the invention, the heat-conducting cross-section of themantle is enlarged at the region of the greatest heatabsorption. As isto be seen from Fig. 1, this is accomplished by simply inserting betweenthe mantle 2 and plates 5 a cylinder in such a manner that it will be ina heat-con ducting connection with the two parts and so as to cause anenlargement of the mantle. In a channel-structure in which the channelsextend vertically on the mantle, this can be effected by constructingthe heat-absorbing plates or lamels as shown in Fig. 3, accord ing towhich the plates consist of U-shaped bent sheet-iron strips 6, 7 havingdifferently spaced shanks and their stems being fastened one within theother and on the mantle, so that one tube or channel always is arrangedor situated at that part of the mantle which is reinforced in the mannerdescribed.

I claim 1. In a liquid heater, the combination of a cylindrical wallforming a combustion chamber, a burner at the lower end of the chamberand tubes for a liquid to be heated mounted on the wall of the chamberand arranged closer together over an area disthereof and arranged todivide the gas into thin layers, said plates/being in fullheatconducting connection with the body of the mantle and said mantlebeing thickened to 5 increase the heat conducting capacity of theportion thereof surrounding said plates, and

a liquid-containing structure of metallic channels in fullheat-conducting connection with the mantle and covering a much larger 10surface area thereof than the area exposed to the gas, substantially asdescribed.

3. In a liquid heater, the combination of a cylindrical wall -forming acombustion chamber, a burner in the lower end of the 1b chamber, asubstantially cylindrical hood closed at its upper end mounted withinthe upper endof the chamber, the wall of said chamber being thickenedover the portion thereof surrounding said hood, a plurality of platesarranged radially between the hood 20 and chamber, and liquid-containingtubes afiixed to the wall of the chamber about said hood and below thesame, substantially as described. i

In testimony whereof I have signed my 25 name to this specification inthe presence of two subscribing witnesses.

HUGO JUNKERs.

Witnesses MAX Knoss, Hummer; ZIMMERM NN.

